Noncontacting finger seals are new compliant seal in gas turbine engine sealing technology. Their potential hydrodynamic and hydrostatic lifting capabilities make them preferable to brush seals and contacting finger seals. The work concerns the mechanism of dynamic leakage of noncontacting finger seal, and a novel dynamic leakage analysis model is proposed. The model combines seal dynamic analysis and seal leakage analysis together to estimate seal dynamic performance through seal leakage. The nature of dynamic leakage performance affected by the change of seal–rotor clearance is revealed. Dynamic leakage increasing is mainly affected by ratio of friction force to finger stiffness, finger mass natural frequency, and rotor excitation amplitude. Results show that the leakage increasing caused by the rotor eccentricity is inevitable. In the design optimization of the noncontacting finger seal, the ratio of friction force to finger stiffness and the rotor excitation should be as small as possible, and the finger natural frequency should be as large as possible.
Dynamic Leakage Analysis of Noncontacting Finger Seals Based on Dynamic Model
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 13, 2014; final manuscript received February 3, 2015; published online February 25, 2015. Editor: David Wisler.
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Du, K., Li, Y., Suo, S., and Wang, Y. (September 1, 2015). "Dynamic Leakage Analysis of Noncontacting Finger Seals Based on Dynamic Model." ASME. J. Eng. Gas Turbines Power. September 2015; 137(9): 092501. https://doi.org/10.1115/1.4029776
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